Question about Pontiac Grand Am

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Where is the a/cdrain for 99 grand am 3.4 v6 when running a/c i dont notice any water draining may be clogged

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The drrain is a black hose, about 1/2 inch in diameter, and it is directly below the heater box, going to the street. You may not always have water that you can see. The issue is relative humidity. If you have somewhat of a low relative humidity, the water may be evaporating AND you may not be removing much moisture from the air.

Usually, if this drain were to be plugged, you get other issues, like fogged windows, and water on the floor boardsx.

Posted on Mar 24, 2011

  • Mark Mccomb
    Mark Mccomb Apr 25, 2011

    guru is very helpful



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We bought a 1994 Pontiac Grand Prix. Its leaking water on the pasenger side by where the air conditiong tubs are. Heating core was replaced about 3 months ago(bought from freind for daughter) Its not...

"Water" there is usually condensation from the AC unit. There is a drain line that runs down under the car in that same area. It is probably clogged with dirt and dust for the heater/ac system. Probably the easiest way to open it is to find the end under the car. Its about a 3/8 inch I.D. hose. Use a turkey baster and back flush it with water. If that doesn't work us a flexible wire and gently run it up the hose with the AC running. You should be able to loosen the clog and get water flowing our of the hose.

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I hear water swooshing from inside my car

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You probably don't have that puddle forming anymore.. the drain is clogged. Next time you have it in for an oil change at a decent shop.. have them locate that hose..give it a blast of air.. to unclog it.. and drain that water..

If the sound is coming from somewhere else.. best to locate it and drain it.. or clean the drain holes..doors etc..

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After a heavy down pour I noticed a large amount of water dripping from behind the glove box. Do I have a clogged drain?

The two drain holes in the compartment beneath the wipers are plugged with debris. Take off wipers.
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Gets water on passenger side floor when A.C. is on. 2003 grand prix GTP

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My 99 grand am gt 3.4 v6 is getting poor antifreze circulation

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